How to make a fire in the wild, without burning the ground?

How do you make a ring of fire on the ground?

• I want to know how to make and what to use to make a ring of fire on the ground. These are often seen in music videos (typically hip hop) where theres a large ring of fire on the ground and the artist performs inside of it. If you look closely in these videos, it usually looks like there is something in the shape of a circle on the ground that is actually on fire but who knows what it is. Any help? anyone maybe done this before??

• Answer:

  steel pipe welded in the shape needed with holes or valves to release propane